1. オーク   oak   elm   birch   fir   Hint Half-n-half Clue   2. ニレ.   cedar   maple   elm   chestnut   Half-n-half Clue   3. モミ   fir   birch   maple   cedar   Half-n-half Clue   4. カエデ.   chestnut   oak   beech   maple   Half-n-half Clue   5. ポプラ.   chestnut   fir   cedar   poplar   Half-n-half Clue   6. マツ   oak   pine   maple   fir   Half-n-half Clue   7. クリ   fir   poplar   elm   chestnut   Half-n-half Clue